!1902 fix(#I4BYML): can't close the ModalDialog use @ref.Close method when write code in razor

* fix: 修复 razor 文件中写好 Modal 二次关闭不响应问题

src/BootstrapBlazor/Components/Modal/Modal.razor.cs

@@ -176,6 +176,10 @@ namespace BootstrapBlazor.Components
             {
                 await dialog.Close();
             }
+            else
+            {
+                await CloseOrPopDialog();
+            }
         }
 
         /// <summary>